Does any port of OWB to Amigoid systems support this?
I'll implement in the MorphOS port, at least.
The OS4 OWB port has a reasonable address bar history, but the Firefox 3.x one is better. Is the OWB MorphOS one as good?
Hard to say. At the moment, the OWB MorphOS one shows a sorted by date/name list with favicon/url/title, popping up for autocompletion if needed. But it can always be improved for sure.
Who says the Friedens couldn't? The GUI is not the hardest part of a browser, but if you get a GUI that hundreds of people already work on, thats a bonus.
It's not really about difficulty but time and motivation. In MorphOS, porting the basic OWB layers such as thread/IO/memory/network and so on took about one week (these layers being more or less the same as the ones needed for Firefox), but the GUI itself is still always in development after more than 7 months (and there's still much to do). So I perfectly see the point in getting for free an already fully functional GUI.